可调螺距的Bernal螺线和螺旋线的设计原理
Design principles for Bernal spirals and helices with tunable pitch
摘要：
使用势能景观理论的框架，我们描述了两个在硅片设计的自组装螺旋胶体超结构的基础上偶极哑铃和Janus型积木，分别。利用外部磁场驱动组装的不对称哑铃，包括屏蔽静电以及磁偶极相互作用，获得具有可控节距长度的螺旋超结构。螺旋线的螺距通过在实验可达到的范围内调制德拜屏蔽长度来调谐。第二种设计是基于由刚性连接的球体与短程各向异性的相互作用，预计自组装成伯纳尔螺旋组成的积木。这些螺旋是相当灵活的，更长的螺旋通过合作进行重排，铰链般的移动，与实验一致。
英文摘要：
Using the framework of potential energy landscape theory, we describe two in silico designs for self-assembling helical colloidal superstructures based upon dipolar dumbbells and Janus-type building blocks, respectively. Helical superstructures with controllable pitch length are obtained using external magnetic field driven assembly of asymmetric dumbbells involving screened electrostatic as well as magnetic dipolar interactions. The pitch of the helix is tuned by modulating the Debye screening length over an experimentally accessible range. The second design is based on building blocks composed of rigidly linked spheres with short-range anisotropic interactions, which are predicted to self-assemble into Bernal spirals. These spirals are quite flexible, and longer helices undergo rearrangements via cooperative, hinge-like moves, in agreement with experiment.
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